Beyonce, Kanye West and John Mayer stunned fans at Jay-Z and Chris Martin's New Year's Eve concert on Friday night (31Dec10), when the trio stepped on stage to perform a set of star-studded collaborations.
The rapper and Coldplay star performed on the same bill in Las Vegas on New Year's Eve (31Dec10) for the grand opening of The Cosmopolitan, a $3.9 billion hotel on Sin City's famous Strip.
But the two acts had a special treat in store for the crowd, causing an uproar when Beyonce joined her husband Jay-Z for a rendition of Forever Young and sang Halo with Chris Martin.
Mayer then sent fans into a frenzy when he stepped on stage to play guitar as Jay-Z rapped his hit song 99 Problems.
The rapper told the crowd, "All the problems you were going through have been kicked out the door," before a collaborative performance of West's Homecoming, which featured the rapper alongside West and Martin,
The show drew a star-studded audience - Martin's wife Gwyneth Paltrow was spotted, as was Cameron Diaz and her baseball star boyfriend Alex Rodriguez, Jennifer Lopez and husband Marc Anthony, and actresses Ellen Pompeo and Blake Lively.